Are large simple trials for dementia prevention possible?

William N. Whiteley, Sonia Anand, Shrikant I. Bangdiwala, Jackie Bosch, Michelle Canavan, Howard Chertkow, Hertzel C. Gerstein, Philip Gorelick, Martin O'Donnell, Guillaume Paré, Marie Pigeyre, Sudha Seshadri, Mike Sharma, Eric E. Smith, Jeff Williamson, Tali Cukierman-Yaffe, Robert G. Hart, Salim Yusuf